const a = Math.floor(3.9999)

const b = ~~3.999
console.log(a);
const c = 1
const c2 = null

console.log(c2 ?? '0o');
console.log(c ?? "ads");

const c3  =  2**3
console.log(c3)

const user = {name:"jack",age:18}

console.log(user?.name)
console.log(user?.show)
